Download  Print this page

Mitsubishi Electric FR-F700PJ Instruction Manual Page 126

Air-conditioning inverter.
Hide thumbs

Advertisement

(3)
Set two different electronic thermal O/L relays (Pr. 51)
Use this function when running two motors of different rated currents individually by a single inverter. (When running two
motors together, use external thermal relays.)
Set the rated current of the second motor to Pr. 51.
When the RT signal is ON, thermal protection is provided based on the Pr. 51 setting.
For the terminal used for RT signal input, set "3" in any of Pr. 178 to Pr. 182 (input terminal function selection) to assign the function.
Pr. 450
Pr. 9
Second applied
Electronic
motor
thermal O/L relay
9999
0
9999
Other than 0
Other than 9999
0
Other than 9999
Other than 0
... Output current value is used to perform integration processing.
... Output current is assumed as 0A to perform integration processing. (cooling processing)
... Electronic thermal relay function is not activated.
REMARKS
 The RT signal acts as the second function selection signal and makes the other second functions valid. (Refer to page 137)
(4)
Electronic thermal relay function prealarm (TH) and alarm signal (THP signal)
100%: Electronic thermal O/L relay alarm operation value
Electronic thermal
relay function
operation level
Electronic thermal
O/L relay alarm
(THP)
NOTE
 Changing the terminal assignment using Pr.190 and Pr.192 (output terminal function selection) may affect the other
functions. Set parameters after confirming the function of each terminal.
(5)
External thermal relay input (OH signal)
Thermal relay
protector
Inverter
Motor
U
V
IM
W
OH
SD
External thermal relay input
connection example
NOTE
 Changing the terminal assignment using Pr. 178 to Pr. 182 (input terminal function selection) may affect the other
functions. Set parameters after confirming the function of each terminal.
Pr.51
Second electronic
First
thermal O/L relay
motor
9999
0
0.01 to 500
9999
0
0.01 to 500
9999
0
0.01 to 500
9999
0
0.01 to 500
100%
85%
OFF
ON
ON
 To protect the motor against overheat, use the OH signal when using an external
thermal relay or the built-in thermal protector of the motor.
 When the thermal relay operates, the inverter trips and outputs the fault signal
(E.OHT).
 For the terminal used for OH signal input, assign the function by setting "7" in any of
Pr. 178 to Pr.182 (input terminal function selection) .
Selection and protection of a motor
GP
GP
GP
V/F
V/F
V/F
MFVC
MFVC
MFVC
RT = OFF
RT = ON
Second
First
Second
motor
motor
motor
 The alarm signal (THP) is output and electronic thermal
relay function prealarm (TH) is displayed when the
electronic thermal O/L relay cumulative value reaches
85% of the level set in Pr. 9 or Pr. 51. If it reaches 100%
of the Pr. 9
Electronic thermal O/L relay
electronic-thermal relay protection (E.THM/E.THT)
occurs.
 The inverter does not trip even when the alarm signal
(THP) is output.
 For the terminal used for the THP signal output, assign
Time
the function by setting "8 (positive logic) or 108
(negative logic)" in Pr. 190 or Pr. 192 (output terminal
function selection) .
MC
IM
MC
U
V
IM
W
RT
SD
setting
121
4

Advertisement

Table of Contents

   Also See for Mitsubishi Electric FR-F700PJ

Comments to this Manuals

Symbols: 0
Latest comments: